Apparatus for exhausting tubes



p 30, 1930. G. VAN ,777,022 APPARATUS FOR nfimg mgg 3 I I v i Filed Oct. i 'gslgjr j 'INVENTOR G.VAN DER HOEVEN B Patented Sept. 30, 1930 UNITED STATES PATENT OFFICE? GERRIT van DER nonvn v, F PARIS, RANC ASSIGNOB- T0 .nnnro conronnrroiv or AMERICA, A conronarron on DELAWARE APPARATUS FOR EXHAUSTING TUBES Application fil ed October 26, 1927, Serial No. 228 751, and in the Netherlands October 29, 1926.1

This invention is connected with apparatus for exciting a high frequency current in a coil mounted on a rotarybody. Y According to the invention power is supplied by an inductive coupling, thesecondaries of which are adapted to rotate with the rotary body whereas the primaries through which passes a high frequency current are stationary. I

This apparatus has awide range of employment in the radio industry in which theelectrodes of dischargetubesare generally deprived of occluded gases by means of high frequency current. For this purpose a machine accordingto the invention may be cone structed comprising heads. forthe said-discharge tubes and high frequency coils mounted on a rotary carrier, the high frequency coils being energized in the manner above indicated. The said coils-are connected in an oscillation circuit formed by a condenser mounted on theicarrier and secondary windings mounted coaxially to the axis of rotation of the carrier. Said windings being 5 surrounded by stationary primary windings the advantage'is obtained'that the coils can be supplied with a highfrequency current in any position of the carrier. 1

According to the invention-the heads for the discharge tubes are adapted to move relatively to the high frequency coils,-'the ad-. vantage being thus obtained thatthe latter can be rigidly secured to the carrier. According to one embodiment of the invention the apparatus is combined with a device for exhausting discharge tubes. The heads are provided with a locking device which can be caused to communicate with the exhaust ing pumps so that it is possible to efiect simultaneously the exhaustion of the discharge tubes and the gas extracting operaf tion by 'means of high frequency current. Thus the advantage is ensured that the lamps can be readily exhausted and are the same time deprived of any residualgases prouced as a result of thegas extracting operation by means of the high frequency current. The

drawing illustrates one embodiment of the so invention.

. In the said drawing:

Figure 1 is a View, partially in section, of an exhausting device in which "high frequency coils rotate with the rotary carrier.

Figure 2 is a diagram showing the .man-

nor in which the'said coils are energized; 1 Referring to Figure 1 a shaftl has rig idly secured to it sleeves 2 and 3 and is iii-- termittently-actuated by a source of energy (not shown). 'Said shaft has alsosecured to it'a valve member 4 which registers-witha stationary body 5 adapted by means of a bore 6 and a conduit 7 to connect an exhausting pump'(not shown) to a bore'8 of. the valve member 4. The said bores are connected by means offlexible conduits 9 to obturating devices 10 in heads 11 which by means of levers 12are pivoted to-the sleeve 2. The said levers 12 carry rollers 13-Which ride on a stationary cam-track 14. I

The sleeve 2 has mounted on it by means of supports 15 coils 16-which consequently are moved when the shaft 1 is actuated. The" sleeve 3 has mounted 'on it a condenser 17 and rods 18 which support a plate19. This plate '19 has secured to it'a frame 22whieh has wound on it windings 23 secured to a v support24: which is stationary by means of rods 25. i r The manner in which'the coils'16 are-energized is diagrammatically shown in Figure 2. In this figure a high frequency cur rent passes through windings-23, the number 21 indicating windings which constitute with the condenser 17 an oscillation circuit with which the high frequency coilslfi are connected in series' 1 The operation of the machine is as follows: V

. The operator inserts a discharge tube by means of its exhausting tube in the obturating device in position A. As the shaft 1' rotated the next lever- 12 together with its obturating device will occupy the position A while the firstmentioned discharge tube will be carriedalong withthecarr-ier. As the roller 18 rides on the raised edge of the-cam track 14: the discharge tube will beslipped into the coil 16.- The high'frequency'current which will be produced by the inductive aclee tion of the windings 23 and 21 in the oscillation circuit 21, 17, 16 will constantly pass through the said coils. By reason of the said high frequency current the electrodes of discharge tubes will be deprived of occluded gases while the exhausting operation is being carried 011, thus driving off the residual gases.

hat I claim is:

1. A device for exhausting evacuated tubes, comprising a coil designed to carry high frequency electrical oscillations, means for carrying the tube within the field of the high frequency oscillations, and an automatic valve connecting the tube to an exhausting means when the tube is in the field of the high frequency oscillations.

2. A device for exhausting evacuated tubes, comprising a coil designed to carry high frequency oscillations, a rotatable frame, supports for tubes carried by said frame, means to rotate said frame thereby carrying the tubes within the field of the high frequency oscillations of the coil, and a valve connecting the supports with an exhausting means when the tube is in the field of the high frequency oscillations.

3. A device for exhausting evacuated tubes, comprising a coil designed to carry high frequency oscillations, a rotatable frame, a plurality of arms mounted on said frame, supports for tubes carried by said arms, means to rotate said frame thereby carrying the tubes within the field of the high frequency oscillations of the coil, and a valve connecting the supports with an exhausting means when the tube is in the field of the high frequency oscillations.

4. A device for exhausting evacuated tubes, comprising a coil designed to carry high frequency oscillations, a rotatable frame, arms pivotally mounted upon said frame, supports for tubes carried by said arms, a stationary cam engaging the said arms, said cam positioning the tubes within the field of the high frequency oscillations and removing them therefrom as the frame rotates, and a valve connecting the supports with an exhausting means.

5. A device for exhausting evacuated tubes, comprising a coil designed to carry high frequency oscillations, a rotatable frame, arms pivotally mounted upon said frame, supports for tubes carried by said arms, a stationary cam engaging the said arms, said cam positioning the tubes within the field of the high frequency oscillations and removing them therefrom as the frame rotates, a stationary valve member, and a rotatable valve member fixed to rotate with the frame to connect the exhausting means with the support and tube when the tube is positioned in the high frequency oscillating field.

6. A device for exhausting evacuated tubes, comprising a rotatable frame, a secondary coil mounted on said frame, a condenser connected in series with the secondary coil mounted on said frame, a plurality of coils connected in series with one another and with the said condenser and secondary coil mounted on said frame, a plurality of pivoted arms on said frame, supports for tubes on the arms, a stationary cam engaging said arms and causing the tubes on the supports to be inserted within a coil and removed therefrom as the frame rotates, a valve automatically connecting the supports with an exhausting means when the tubes are within the coils, and a primary coil surrounding said secondary coil and designed to carry a high frequency oscillating current.

7. A device for exhausting evacuated tubes, comprising a rotatable frame, a high frequency oscillating circuit mounted on said frame including a plurality of coils, supports for tubes on said frame, means to bring the tubes within the field of the coils, and a valve connecting the tubes with an exhausting means during the time the tube is subject to the high frequency oscillating field of the coil.

8. A device for exhausting evacuated tubes, comprising a rotatable frame, a high frequency oscillating circuit mounted on said frame including a plurality of coils, a secondarycoil in series With said oscillation circuit mounted on said frame, a stationary primary coil surrounding the secondary coil, supports for tubes on said frame, means to bring the tubes within the field of the coils, and a valve connecting the tubes with an exhausting means during the time the tube is subject to the high frequency oscillating field of the coil.

9. A device for exhausting evacuated tubes, comprising a rotatable frame, a high frequency oscillating circuit mounted on said frame including a plurality of coils, supports for tubes on said frame, a cam adapted to bring the tubes within the field of the coils, and a valve connecting the tubes with an exhausting means during the time the tube is subject to the high frequency oscillating field of the coil.

10. A device for exhausting tubes, comprising a rotatable frame, means on said frame for producing high frequency oscillations, stationary means for energizing the means on the frame, stationary exhausting means, means rotatable with the frame for inserting the tube into the field of the high frequency oscillating means, and means for automatically connecting the tube with the exhausting means as the tube is heated by the high frequency field.

' GERRIT VAN DER HOEVEN. 

